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    Fatal crash on sta.scan() in UIFlow2 v2.4.4 on Tab5 - firmware bug

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    • RunaqueR Offline
      Runaque
      last edited by

      Hey everyone,

      Yesterday I got my M5Stack Tab5 and started building a wardriving app in UIFlow2 MicroPython. During development I discovered that calling sta.scan() causes a fatal Guru Meditation Error every single time, crashing and rebooting the device.

      After extensive testing I can confirm:

      • The crash is 100% reproducible - every scan attempt crashes
      • The same crash address (MEPC: 0x4ff13582) appears every single time
      • It happens regardless of code complexity, UI framework, scan interval or WiFi credentials
      • It cannot be caught by Python exception handling - it crashes below the MicroPython VM
      • Register analysis points to a null pointer dereference in the esp-hosted SDIO transport layer after an ETIMEDOUT on the ESP32-C6 coprocessor

      I've filed a detailed bug report on GitHub including a minimal reproducer, crash dump analysis and probable root cause:

      👉 https://github.com/m5stack/uiflow-micropython/issues/94

      Has anyone else hit this on their Tab5? Any confirmations would help strengthen the case for a fix!

      [url=https://wigle.net][img]https://wigle.net/bi/t2siA9I1JCSX8NFkxbPOFQ.png[/img][/url]

      RunaqueR 1 Reply Last reply Reply Quote 0
      • RunaqueR Offline
        Runaque @Runaque
        last edited by

        Additional finding: Secondary firmware bug — boot sequence crash on cold boot (MEPC: 0x00000006)
        While investigating the sta.scan() crash, I discovered a second distinct firmware bug affecting the Tab5 in UIFlow2 v2.4.4.
        Description:
        On every cold boot, the device crashes during UIFlow2's initialization sequence before any user code runs. The device automatically reboots and boots successfully on the second attempt.
        Crash signature:
        Guru Meditation Error: Core 1 panic'ed (Instruction access fault). Exception was unhandled.

        MEPC : 0x00000006
        MCAUSE : 0x00000001
        MTVAL : 0x00000006
        Key observation:
        The stack contains 0x7474696c (ASCII: "litt") pointing to a crash inside UIFlow2's LittlevGL/LVGL initialization sequence — not in user code.
        Reproducibility:

        100% reproducible on cold boot
        Device always self-recovers on automatic reboot
        Completely independent of user code — happens before any user application starts

        This is a separate bug from issue #94 (sta.scan() at MEPC: 0x4ff13582). Both bugs share the same root environment (UIFlow2 v2.4.4 on Tab5) but occur at different stages and involve different subsystems.

        [url=https://wigle.net][img]https://wigle.net/bi/t2siA9I1JCSX8NFkxbPOFQ.png[/img][/url]

        1 Reply Last reply Reply Quote 0

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